Ukash virus

Thank you for your offer of help via the remote support, but you have not grasped what I wrote about initially. I had to buy a competitors software (Enigma) to rid myself of this virus. My AVG software did not protect me from it. This is what it is:-
The so-called Ukash Virus is a ransomware Trojan that receives its name because Ukash Virus requires that its victims use Ukash (a legitimate money transfer service) to transfer the ransom funds. This dangerous Trojan infection is composed of a Winlocker component that basically blocks access to the infected computer system, disabling access to the infected computer system's desktop, Task Manager, command line, Registry Editor and other services and applications. There are countless variants of the Ukash Virus, designed to target various different countries in Europe and North America. ESG malware analysts strongly advise against paying the ransom that this malware infection tries to extort from its victims. Instead, variants of the Ukash Virus should be removed with the help of a reliable anti-malware application.
So, why doesn't your system protect against it? I wish it did!
David